Packing for piston-rods.



. f UNITED STATES PATENT onnion.

.PACKING FOR PISTON-RODS.

Specification of Letters Patent.

Patented April 16, 1907.

Application filed May 10,1906. Serial No. 316,069.

To cir/ZZ whom, t rluty concern:

Be it known that I, WILLIAM HILLMAN, a citizen of the United States, residing at Mount Vernon, Westchester county, New York, have invented certain new and useful lIm rovements in Packing for Piston-Rods an the Like, of which the following is a full, clear, and exact description.

My invention relates to improvements in packings, particularly of advantage when used to form steam-tight joints for pistonrods and the like.

The object of the invention is to provide a simple and effective construction. The packinU is flexible or elastic.

n the drawings, Figure 1 is Aa perspective view of the metallic element of the packing as it appears during the process of construction. Fig. 2 is a sectional view thereof as it ppears when completed, taken on the line X Fig. 3. Fig. 3 is a view of the under side of a portion of the metallic element of the acking. Fig. 4 is a cross-section on the plane of the line Y Y, Fig. 5, showing the structural formation of the completed packing. Fig. 5 is a longitudinal sectional view of a portion of the finished article. Fig. 6 is a sectional view of a modification.

1 represents the backing or main body portion of the packing. This body portion is formed of a suitable fabric-like material in which asbestos,l for example, is interwoven.

- This fabric is rolled up to the proper size, the

several layers being, if desired, cemented together by a suitablefcementing element not affected by heat. The backing when finally formed has an outline in cross-section substantially rectangular-that is, adapted to the space into which it is to be inserted when in use. Within an outer Vfold of the backing is inclosed or held the metallic element thereof, which may be termed a facing. This metallic element is illustrated at 2'. The construction of this element comprises a strip of suitable antifriction metal-for example, van alloy, such as Babbitt metal-and while the said strip may be formed in any desired way it is preferably formed of a tube-like member, such as illustrated in Fig. 1, said tube being slitted or recessed through one side,.as shown, to form a series of connecting or transverse bars, between which the material of the backing may find a suitable anchor-A age when the entire body -of the packing is compressed into its final shape. This. anchorage prevents the creeping of the metallic portion of the packing relatively to the backing. It also serves to more intimately hold said elements together against stripping.

.These slits or recesses perform a further function-to wit, they weaken the strip to such an extent that the desired fiexibility may be had, the solid portion of the strip being of course sufficiently thick to prevent breakage in ordinary use. 3 3 represent the slits or recesses above referred to.

4 represents a holding-flapwhich may be in the form shown in Fig. 4, one edge of said flap being integral with the backing. This flap mayI be folded over the imperforate and unslitted surface of the metallic facing, and the eXtreme edge may be secured to the body of the backing, so as to hold the metallic portion in intimate contact with the main body of the backing. I-Iere again a suitable cementing element may be employed.

The entire body portion is preferably impregnated or treated with a suitable lubri.- cant, which serves to increase the effective life of the article.

' Fig. 6 illustrates a modification in which the metallic facing-strip 2 may be coveredby uan envelop 5, of suitable material. In this modification the core l'd1 ofthe body portion may be formed in any suitable way and of any suitable material. It in `turn may have an outer covering or envelop, (indicated at 6.) This covering 6 may inclose the bottom and sides of the core, while the upper edges may embrace partly or entirely the envelop 5 of the facing-stri It should be understoo that I have not attempted to show all of the modifications that my invention is susceptible of, but have elected to show only preferred forms thereof, the fundamental or essential idea being to provide metallic facing-strip which shall have a continuous or unbroken bearing face or surface and a slitted or recessed rear face, the advantages ofsaid recesses or slits being set forth above. By this construction the metallic portion may be uniform] y and closely fitted to the piston-rod and may be held in intimate contact by the elastic and iiexible backing portion. By reason of the construction of the metallic portion the packing is sufficiently flexible to be applied to various sizes of piston-rods. By having the bearing-surface of the metallicl portion continuous or unbroken the greatest possible amount of antifriction material is provided and the durability and effectiveness of the IOO IIO

packing is substantially enhanced. By havmg the bearing-surface continuous it is like- Wise apparent that there will be no opportunitT for particles of foreign matter to become lodged thereonand hence the danger of scoring the rod is entirely eliminated.

These and other advantages Will be apparl ent to the mechanic skilled in the use of such materials.

l. A packing for piston-rods and the like comprising, a metallic strip having a continuous exposed bearing-faceand a slitted or recessed rear face, and a flexible and elastic backing applied to the rear face of said metallic portion.

V2. A packing for piston-rods and the like comprising, a metallic strip having a continuous bearing-face and a slitted or recessed rear face7 and a flexible elastic backing applied to the rear face of said metallic portion, said metallic portion being formed of tWo thicknesses of metal connected at one edge.

3. A packing for piston-rods and the like comprising, a metallic strip havingA a continuous bearing-face and a slittedor recessed rear face7 and a flexible elastic backing applied to the rear face of said metallic portion, said metallic )ortion being formed of two thicknesses of metal connected at both edges.

4t. In a packing for piston-rods, an eX- posed facing member havin an unbroken bearing-face, an elastic and eXible backing of fabric-like material built up in layers, said layers being cemented together7 and slits or recesses in the rear surface of the facing member, a portion of said backing projecting into said slitted or recessed portion thereof.

5. In a packing for piston-rods and the like, a metallic facing-strip having a continuous unbroken exposed. bearing-surface, a recessed rear face, a backing portion of ilexible material in engagement with said recessed surface of the facing-f and a retaining-flap extending from one side of said backing portion to the other' side thereof and over said facing member..

WILLIAM HILLMAN.

Witnesses:

R. C. MITCHELL, L. VREELAND. 

